Stop mechanism for bakers&#39; ovens.



PATENTED JUNE 26, 1906.

J. J. LINDEN. STOP MECHANISM FOR BAKERS OVENS.

APPLICATION FILED JAN.23. 1905.

2 SHEETK-SHEET 1.

a4 a A PATENTED JUNE 26, 1906.

J. J. LINDEN. STOP MECHANISM FOR. BAKERS OVENS.

APPLICATION FIL ED JAN.23. 1905.

2 SHEETS-SHEET 2.

UNITED STATES PATEN OFFICE.

JOHN J. LINDEN, OF NEW YORK, N. Y

STQP MECHANISM FOR BAKERSTJVENS;

Specification of Letters Patent.

Patented June 26, 1906.

Application filed January 23, 1905. Serial No. 242,257.

. provements in Stop Mechanism for Bakers the reel sho Owens, of which the following is a specification.

My invention relates to that class of bakers ovens in which a revolving reel carries the material to be baked. This reel is equipped with twelve or any desired number of shelves so. hung as to remain horizontal during the revolut on of the reel. Sometimes these shelves are single and adapted to receive only a sin le row of ans. Sometimes the shelves are ouble-dec ed, so that they can receive two sets of pans, one above the other. The reel is usually so set as to present the shelves in succession to the oven-door, and for light work, such as crackers or biscuit, the heat of the oven is so controlled with reference to the revolution of the reel that a single revolution is sufficient to bake the dough or other material in the pans: In this way the process of baking may be made continuous, the finished pans being removed and pans with fresh material being substituted continuously as the shelves present themselves at the ovendo'or. For the successful operation of such an oven it is of course necessary that some stopping and startin mechanism for ul be used, so t at the reel shall not move during the short space of time reuired for the removal of the pans from one s elf and the substitution of fresh pans. It is also necessary that means should be pro vided for regulating the sto ping-places of the reel, especially with doub e-deck shelves, so that the stopping shall occur in line with the oven-door.

. The object of my invention is to provide an improved stop mechanism which 1s automatic in its operation and capable of adjustment, so that when the reel is set in motion it will be stopped automatically at the predetermined point without any action on the part of the baker, whose only attention to the reel is to release or throw back the stop mechanism' as soon as he has changed the pans,so that the reel may start again, and then Wait for the reel to brin the next tray to the door,

when it will stop 0? itself until again released. In the accom angiig drawings I have shown two-slightly erent apphcations of my lnvention, in one case the stop mechanism being set above and in the other below the drive-wheel of the reel in order to accommodate itself .to the available space at the side of the oven.

Figure 1 is' a side elevation showingl the wall ofthe oven partly broken and wit the stop mechanism set above the main wheel. Fig. 2 is a sideelevation showing the mechanlsm set below the main wheel. -Fi 3 is an enlarged plan of the wheel and rate et of Same letters indicate similar parts in thediflerent figures.

First describing that form of myinvention where the stop mechanism is setabove the drive-wheel of the reel, which form is represented in Fig. l of the drawings, the letterA indicates the reel, and B the swiveled shelves or trays carried by said reel. Cindicates the oven-door, in front of which the baker stands.

D indicates the main or driving wheel, which is provided with a worm upon its periphery, sa1d worm-wheelbeing disposed outside of the oven and mounted upon a shaft a, which passes through the brick wall forming the side of the oven. It will of course be understood that the reel, which is of ordinary construction, is mounted on '=the shaft 0. inside of the oven. The rotation; of this reel is brou ht about in the followin manner: A worm mounted ona worm-s aft 6, meshes with the teeth of .worm-wheel D and is thereby capable of turnin said worm-wheel. Said shaft, 1) is journa ed inbearin s C C C in supports 0, c, and c, that are astened to the brick wall of the oven, and said shaft 1) is turned by the usual pulley F, that is driven by belting from a source of power. tion of the stop mechanism is therefore to shift the belting from said pulley F, which is (Not shown.) The funcj fast on the shaft 1), to a loose pulley F, thereby preventing the transmission of power to the shaft 6 and simultaneously overcoming the momentum or inertia of the reel and its drivin mechanism'by the application of a suitab e brake. G indicates the belt-shifter,

which is mounted on a rod d, that is slidably.

ism provides means or moving the beltshifter automaticallyby the rotation of the Worm-wheel D when it reaches a point determined by previous adjustment. It also provides for braking the driving-shaft simull tions, and the belt is shifted back to the fast taneously with the shifting of the belt to the slots it, through which tap-bolts passinto the hub-plate of the worm-wheel D. By

tumihg the hub ft to the right and left, first vr-lo'osenmg the tap-bolts j, the throw of the worrnwheel 1n operatingthe stop mechan-' ism is regulated, and by tightening said tapbolts so as to bind the hub-plate in the set position the successive throws are fixed until such time as a new adjustment may be desired. Mounted on the hub-plate 7b is the ratchet J, whose teeth 7c are shaped, as shown, so as to receive the pins Z n of a shifting-arm. cm, one end of which is pivoted to a lug g, that is fast upon the rod d. The shifting-arm m is arranged above the ratchet-wheel in this form of my invention, whereby the pin Z falls into the recess in front of one of the teeth by.

gravity, and said shifting-arm 'm in'the rotati on of the ratchet by the tiirning of the wheel is thereby pushed, together with the rod (1 toward the front of the even, this action shifting the belt from the fast pulley F onto the loose pulley F thus disconnecting the power. By the continued rotation of the ratchet the eripheralsurface of the tooth bears against the pin it, thereby raising the shifting-arm m and disengaging the pin Z from said tooth.

Mounted on. the wornnshaft b is a wheel M, just above which a brake-shoe M hangs from an arm 8, one end of which arm is pivoted to the bearing M A weight t is provided at or near the opposite end of the arm 8. Qbviously when this weight is allowed to exert its force on arm 8 the brake-shoe'M thenpresses on the wheel M and prevents the Worm-shaft b from turning. It is therefore necessary to provide means lifting the arm 8 against the force exerted-by the weight if in order tobrake and stop the rotation of wormshaft 6 at such period when the pin Zhas been raised out of engagement with a tooth on the ratchet-wheel. Two ways of lifting said arm 8 to release the brake M from the wheel Mto permit the operation of the worm-shaft b are provided, one way being used when the reel is to be started and stop ed intermittently for each tray and the ot er way when the reel is to be allowed to run for a time WltllOlllx interruption. In the first case the handle H, pivoted to a bracket e at the front of the oven, is used.- This handle is l pullev F. loose or idle pulley. It also provides for in this view.

Also in this action the brakeslide 31 is lifted by the following instrumentalitics'. On the rod (Z is a block (1, which is adj ustably connected with a brake-lifting device 11; bv a short link in, that is shown in dotted lines. The brake-lifting device w is pivoted at w to the ovenwvall and has a vertical slot 3 in which the end of the link a: is

slidably engaged. hen said brake-lifting device stands in a vertical position, the brakeshoe on the arm .9 does not press upon the wheel M but when the rod (I is moved so as to shift the belt onto theloosepullcyF it, through the link .90, swings the brake-lifting device out of the perpendicular, and thus permits the brake-shoe to descend upon the wheel M. It will therefore be readily understood that in the baking of crackers and other material which requires only a single revoln 3 tion of the wheel the baker, standing at the door of the oven, has only to remove the pans of baked material from one tray at a time as the reel is automatically stopped and as soon as the fresh pans have been placed on the tray pull the handle H, and thus start the reel turning again.

When the reel is to be .run several revolutions without stopping, the stop mechanism is thrown out of action by means of a handle 7, which is at the end of a rod p. As shown in Fig. 1, this rod p is suspended from the support 0 by a link 0, to which it is pivoted at q. The upper end of this link 0 may be forked or otherwise adapted to engage the shifting-arm m, so that when the handle r is pulled outwardly to bring said link 0 into a vertical position it thereby lifts up said arm m and holds both pins Z and it out of engagement with the ratchet J. At the same time, by means of a rod e, which is pivoted at g to the rod 19 and which is slotted at its upper end to receive a pin a on the end of rod 8, said rod 8 is by the aforesaid action of rod '1) lifted to hold. the brake M away from the wheel M. Hence by the drawing out of the rod p the wheel is permitted to rotate continuously until the baker pushes in the rod p, and thus throws the stop mechanism again into action.

In the construction illustrated in Fig. 2, wherein the shifting-arm m is set below the wheel, the pin Z- is pressed into the toothspace by a weight I on the arm m, which is pivoted at m. In this form the motion of the wheel D draws the rod (1, (which is fast to the lug g, that forms the ivotal bearing m,)

away from the-front of t e oven to shift the F,the positions of these pulleys being reversed Some other differences comrised-in the form of my invention shown 1n 1g. 2, whereby the same result 1s attained in a slightly different way, are as follows:

The rod p is mounted in hearings in. the supports a 0, and the rod '0 is forked at the upper end to embrace and lift the arm m.

pm, as before, on the rod .9.

It is also provided with a slot y in which Works a In this view the rod 1) has a pivotal connection 3 with the brake-lifting device w, which latter is pivoted at 3 to the link x. In this view also the action of the rod 12 is the reverse to that shown in Fig. 1, it being pushedinwardly to enable the rod 1) to release the mechanism for continuous running of the wheel. I

By means of a wheel N, attached to-the worm-shaft I), (this wheel being shown in Fig. 2, but not shown in Fig. 1,) the said shaft may be turned by hand Whendesired.

wheel, and a shaft carrying said wheel, a ratchet-wheel loose upon said shaft, a hubplate for said ratchet-wheel having concentric slots to receive said tap-bolts,wvhereby the ratchet-wheel may be adjusted'circularly with relation to said wheel and connected thereto as adjusted, a belt-shifting rod normally held in engagement with said ratchet-wheel and operated thereby at predetermined intervals, and means whereby braking action 'is applied when the power is shut off, together with means for reapplying the power and removing the braking action.

JOHN J. LINDEN. Witnesses:

ALFRED J. KENNEDY, LoUIs H. RAVNER. 

